Yeah, it is a bit broken on the Asus isn't it? I was wondering if a separate window for the serial monitor area might help. Maybe a dockable window so you can have it all in one as at present or tear it off and alt-tab between them.
Should be pretty easy to make the serial monitor panel show above the editor panel if the window size is less than 500px. I will try to take a look at it (since I do most of my editing on my EEE) and see if I can provide a patch to fix it.